Berber carpets for mid-century modern. "This beautiful bound carpet from Mohawk. It is called "Mill View" in Skylark. The carpet is part of the SmartStrand Forever Clean Carpet. Aka- the toughest, easiest to clean carpet on the planet.
I have always wanted wall-to-wall sisal carpeting, like this kind shown here at Desire to Inspire. Especially against a classic dark navy or black wall, it has such a sophisticated feel. Rugs layered on top define smaller spaces within the room well, too.